This paper presents new insights on the galloping instability phenomenon of square-section prisms. The role of the orientation of the structural axes on the galloping response is studied through wind tunnel tests and quasi-steady theory. A new series of dynamic wind tunnel tests on a square section model were conducted to evaluate non-across-wind galloping vibrations, as well as conventional across-wind galloping. The results are then compared with theoretical predictions to evaluate the reliability of quasi-steady theory in assessing the galloping phenomenon. It is found that for a given angle of attack, the structure has different aeroelastic behaviour for different orientations of the principal axis. At an angle of attack close to the critical angle of attack of square prisms, the quasi-steady theory well predicts the critical wind velocity for the onset of non-across-wind galloping but it is not successful for the case of across-wind galloping.

中文翻译：

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方截面圆柱体的非横风驰骋

本文对方形截面棱镜的飞驰不稳定现象提出了新的见解。通过风洞试验和准定常理论研究了结构轴的方向对驰骋响应的作用。对方形截面模型进行了一系列新的动态风洞试验，以评估非横向风驰骋振动以及传统横向风驰骋。然后将结果与理论预测进行比较，以评估准稳态理论在评估飞驰现象方面的可靠性。发现对于给定的攻角，结构对于主轴的不同方向具有不同的气动弹性行为。在接近方形棱镜临界攻角的攻角处，